<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;"/>

    <el-tree
      ref="tree2"
      :data="data2"
      :props="defaultProps"
      :filter-node-method="filterNode"
      class="filter-tree"
      default-expand-all
    />

  </div>
</template>

<script>
  import { all } from '@/api/subject'

  export default {
    name: 'list',
    data() {
      return {
        filterText: '',
        data2: [],
        defaultProps: {
          children: 'children',
          label: 'title'
        }
      }
    },
    watch: {
      filterText(val) {
        this.$refs.tree2.filter(val)
      }
    },
    created() {
      all().then((res) => {
        this.data2 = res.data
      })
    },
    methods: {
      filterNode(value, data) {
        if (!value) return true
        return data.title.indexOf(value) !== -1
      }

    }
  }
</script>

<style scoped>

</style>
